Machine for refacing valve-seats.



' No. 843,615. v PATENTED F EB.12 1907.

' R. F. LACE & J. ULRICH.

MAGHINE FOR REFAGING VALVE SEATS. APPLICATION F ILBD DEO.12, 1906.

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No. 843,615. PATENTED FEB. 12, 1907.

- R. F. LACE & J. ULRICH.

MACHINE FOR REPAGING VALVE SEATS.

APPLICATION FILED DEC. 12. 1905.

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ammow v and/ J ammmm RaymondRLacg UNITED STATES PATENT OFFICE.

MACHINE FOR REFACING VALVE-SEATS.

Specification of Letters Patent.

Patented Feb. 12, 1907.

Application filed December 12, 1905- Serial No. 291.385.

To all whom it may concern.-

Be it known that we, RAYMOND F. LACE and JOHN ULRICH, citizens of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Machines for Refacing Valve-Seats; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of our invention is the provision of an improved machine in which the cutting-tool is moved in a straight line and is automatically fed laterally with a step-by step motion.

In the accompanying drawings, illustrating an embodiment of the invention, Figure 1 is a top plan view. Fig. 2 is a view in elevation of the upper end of Fig. 1. Fig. 3 is a similar view of the lower end of Fig. 1. Fig. 4 is a sectional view on the line as at, Fig. 1, with some parts omitted for the sake of clearness. Fig. 5 is a detail, partly in section and on a larger scale, of the means for feeding the toolcarriage laterally. Fig. 6 is a detail, with parts in section, illustrating a clutching device for connecting the power to drive the tool-holder. Fig. 7 is a sectional view on the line y y, Fig. 6.

In the views, 1 designates the frame or bed upon which the operative parts are carried.

2 is a carriage that slides on suitable ways on the bed. I

3 is the tool-holder, that slides in suitable ways on the carriage.

The carriage moves longitudinally with reference to the bed shown, and the toolholder moves in a direction at right angles to the direction in which the carriage moves.

Journaled longitudinally in the bed is a driving-shaft 1 upon which is a pinion 1*, connected with the shaft so as to be turned thereby, but be slidable longitudinally thereon, and connected with the carriage so as to be carried with it back and forth across the bed.

1 designates a screw mounted longitudinally in the bed and provided with means to lock it from turning.

4 and 5 designate pinions that engage a rack-bar 3 on the under side of the toolholder. Each of these pinions 4 and 5 has a tubular shaft 4 provided with a head 4* and a projecting end 4 beyond the head. On

the ends 4 of the shafts 4 are hollow spurgears 6 and 7, the former being larger than the latter. The spur-gears 6 and 7 are loose on the ends 4; but each is adapted to be internally clutched to the shaft by means ofa plit friction-band a on the rim of the heads 7 4 said ring being spread by a wedge pin 43, working between the ends of the ring, as seen in Figs. 6 and 7. The wedge pin 4 of the pinion 4 is operated ;by means of rods 8 and 9, passing into the hollow shafts, each having a beveled end that works under the inner end of the wedging pin. When the rod 8 is thrust inward, the larger spur-gear 6 is clutched and the pinion 4 operates the toolholder, and when the rod 9 is thrust inward the smaller gear 7 is clutched and the pinion 5 operates the tool-holder. The outer ends of the rods 8 and 9 are annularly racked and are engaged by the racked opposite ends of a pivoted block 10, having attached thereto a toothed sector-arm 10*. The toothed portion of the sector-arm 10 is engaged by the toothed portion of another sector-arm 10 and the ends of the two sector-arms are connected by a coiled spring 10, that tends to pull said arms toward each other after a dead-line, which includes the pivotal points of the sector-arms and the points of connection of the coil-spring therewith, is passed. Thus it will be observed that the coil-spring 10 tends to thrust inward one or the other of the rods 8 and 9, according to the position of the sector-arms 10 and 10 and the positions of these arms are shifted by the contact of a dog 3 or 3 on the tool-holder 3.

The larger spur-gear 6 is engaged and driven by the pinion 1 and as the spur-gear 6 engages the small spur-gear 7 the latter is also driven indirectly, but in a reverse direction, by the said pinion 1*. To prevent overheating the tool, the outward movement thereof should be slow. Hence the gear 6 is of larger diameterthan the gear 7, and the arrangement is such that each of the gears shall be clutched to its companion pinion 4 when the tool-holder reaches the predeter mined limit of its movement, which limit is established by the location of the dogs 3 and 3 the dogs being adjustable on the toolholder and provided with means for securing them at the desired points. The proper direction for turning the driving-pinion 1 is of course that indicated by the arrow, Fig. 4. Hence in operation when the dog 3 strikes the sector-arm 10 and carries it and the IIO arm 1O beyond the before-described deadline the spring 10 effects the unclutching of the gear 7 and the clutching of the gear 6. The motion of the tool-holder is thus reversed, because the pinion 4 becomes the operated pinion, while the pinion 5 becomes an idler. In the outward movement of the tool-holder the dog 3* strikes and carries over the sector-arm 10", thus unclutching the gear 6 and clutching the gear 7, rendering operative the pinion 5 and idle the pinion 4, in -which case the tool-holder is carried back and with greater speed than it had in the out ward movement.

To move the carriage 2, and therefore the tool-holder, laterally to make a cut in a fresh place, we put upon the screw 1 a threaded sleeve 12, that is swiveled to the carriage 2, so as to pull or push it when the sleeve is turned. This sleeve 12 has an annular ratcheted surface 12 that is engaged by a pawl 13, adapted to slip over the teeth when moved in one direction and to engage the teeth and rotate the sleeve when moved in the opposite direction. The pawl 13 has a shank 13 and is pressed inward by a spring 13 that encircles the shank and has its outer bearing on a fixed stop 13". The shank 13 passes through the stop 13 and has secured at its outer end a button 13 provided at its inner side with a key that engages a corresponding notch in the stop 13. By pulling the pawl out against the pressure of the spring and turning the button half-way round the position of the engaging end can be reversed. The pawl is carried in a tube-like socket 1 1, having at its inner end a transverse sleeve that encircles the ratcheted threaded sleeve 12, and this tube-like socket is connected by means of a link 14* with a disk 15, that turns loose on the end of the shaft 4, that carries the gear 7; but the disk 15 is in slipping frictional engagement with another disk 16, keyed on the shaft to turn therewith, but so that it can be pressed by means of a nut 17 with the desired tension toward the disk 15. If desired, a leather ring (not shown, but well understood) can be interposed between the two disks 15 and 16 to make a nicely-adjustable tension. From this construction it will be observed that every stroke of the tool-holder oscillates the tube-like pawl-carrier, and consequently on alternate strokes rotates the threaded collar 12, and therefore feeds the carriage 2 laterally with an intermittent motion and in a direction according to the position of the engaging end of the pawl.

20 designates an adjustable stop against which the tube-like holder of the pawl strikes to limit the throw of the pawl, and therefore the extent of the lateral feed and size of the cut to be made with the tool.

The bed 1 is furnished with two brackets 18 and 19, bolted to slots 1 in the bed, so that said brackets can be adjusted to stand at different distances apart, and said brackets have slotted arms 18 and 19 projecting horizontally beyond the bed, so that the machine can be attached to the top of the cylin der the valve-seat of which is to be refaced. The adjustability of the arms 18" and 19 makes the machine adaptable to cylinders of different size. 7

When the carriage reaches the limit of its movement at one end of the bed, the direction of motion or feed can be reversed by turning the button 13 The cutting-tool (designated 21) can be adjusted up or down by means of a headed screw 21 By loosening the holding-nut 1 of the screw l 'and applying a crank to the square end 1 of said screw 1 the carriage can be shifted rapidly from one end of the bed to the other.

What we claim, and desire to secure by Letters Patent, is-

1. In a machine for refacing the valveseats of cylinders or other objects, the combination of a bed or frame, a carriage slidably mounted on said bed, a reciprocative tool-holder on said carriage, a rack on said tool-holder, hollow shafts mounted in said carriage and having pinions thereon engaging said rack, spur-gears having annular inwardly-facing rims, the said spur-gears being loosely mounted on saidhollow shafts and engaging each other, clutching devices adapted to engage said rims, rods slidable in said hollow shafts to actuate said clutches, means operated by the tool-holder to alternately operate said. rods, a driving-shaft and pinion thereon engaging one of said spurgears, and means for imparting to said carriage intermittent progressive movement lateral with respect to the reciprocative movement of the tool-holder.

2. In a machine for refacing the valveseats of cylinders or other objects, the combination of a bed or frame, a carriage slidably mounted on said bed, a reciprocative tool-holder on said carriage, a rack on said tool-holder, hollow shafts mounted in said carriage and having pinions thereon engaging said rack, spur-gears having annular inwardly-facing rims, said spur-gears being loosely mounted on said hollow shafts and engaging each other, .clutcliing devices adapted to engage said rims, rods slidable in said hollow shafts to actuate said clutches, a pivoted block engaging said rods, a toothed sector-arm secured to said block, a second toothed sector-arm engaging the first-mentioned sector-arm, a spring connecting said sector-arms, lugs on the tool-holder near its ends to strike the second-mentioned sectorarm whereby the said pivoted block is oscillated to move said rods, a driving-shaft and pinion thereon engaging one of said spurgears, and means for imparting to said carriage intermittent progressive movement lateral with respect to the reciprocative movement of the tool-holder.

3. In a machine for refacing the valveseats of cylinders or other objects, the combination of a bed or frame, a carriage sliding on said bed and a tool-holder sliding on said carriage in a direction at right angles to the direction in which the carriage slides, said tool-holder having a rack-bar thereon, means for reciprocating said tool-holder including a pinion to engage said rack-bar, said pinion having a shaft, a driven gearwheel on the shaft of the pinion w ith means for clutching it to the shaft, and means for sliding said carriage with an intermittent motion comprising a stationary screw in the bed, an internally-threaded and externallyratcheted sleeve sn iveled to the carriage, a pawl engaging said sleeve, a slipping frictionclutch between the shaft of the pinion and the ratchet, means connecting said slippingclutch and pawl whereby the latter may be oscillated to turn the sleeve on the stationary screw, a stop to limit the movement of said pawl, and means whereby the pawl may be reversed to slide the carriage in an opposite direction.

4. In a machine for refacing the valveseats of cylinders or other objects, the combination of a bed or frame provided w ith means for attaciing it to the work, a carriage sliding on said bed and a tool-holder sliding on said carriage in a direction at right angles to the direction in which the carriage slides, said tool-holder having a rack-bar ti ereon, means for reciprocating said tool-holder including a pinion to engage said rack-bar, said pinion having a shaft, a driven gearwheel on the shaft of the pinion ith means for clutching it to the said shaft, and means for sliding said carriage with an intermittent motion comprising a stationary screw in the bed, an internally-threaded and externallyratcheted sleeve swiveled to the carriage, a pawl engaging said sleeve, a slipping frictionclutch between the shaft of the pinion and the ratchet, means connecting said slipping clutch and pawl whereby the latter may be oscillated to turn the sleeve on the stationary screw, and means whereby the pawl may be reversed to slide the carriage in an opposite direction.

5. In a machine for refacing the valveseats of cylinders, the combination of a bed or frame provided with means for attaching it to the cylinder, a carriage sliding on said bed and a tool-holder sliding on said carriage in a direction at right angles to the direction in which the carriage slides, said tool-holder having a rack-bar thereon, and means for reciprocating said tool-holder including a pinion to engage said rack-bar, said pinion having a shaft, a driven gearwheel on the shaft of the pinion w ith means for clutcli ing it to said shaft and means for sliding said carriage with an intermittent motion comprising a stationary screw in the bed, an internally-threaded and eXternally-ratclreted sleeve on t e screw, said sleeve being s iveled to the carriage, a pawl engaging said sleeve, a slipping friction-clutch between the shaft of the pinion and the ratclr et and means connecting said slipping-clutch and pawl wh ereby the latter may be oscillated to turn the sleeve on the stationary screw.

In testimony wlereof we afiix our signatures in presence of two witnesses.

RAYMOND F. LACE. JOHN ULRICH.

I/Vitnesses:

ULYSSES R. PETERS, GEORGE M. FINOKEL. 

